[BUG] feat and umap cache incomplete runs

[lmeyerov]

Describe the bug

When canceling (or getting an exception) during feat/umap, that gets cached for subsequent runs. We expect them to be not cached, e.g., recomputed, on future runs.

To Reproduce

Expected behavior

The caching flow should catch the interrupt/exn, ensure no caching, and rethrow.

Actual behavior

Screenshots

Browser environment (please complete the following information):

Graphistry GPU server environment

PyGraphistry API client environment

Additional context